[support] Geotagging and GIS in Drupal?

Hello, another thing I'd need from Drupal is Geotagging support, that is the ability to categorize and search content based on location: "This node is associated these coordinates" "List all relevant nodes associated to places maximum 100 miles from my home" I've seen with Google there is a location module. I'll study it, but any feedback, code example, URLs of Drupal sites already doing this etc are greatly appreciated. TIA, Ortles